Better yet, and here is where I got my epiphany, scientists have produced a long-term graph of sea level changes, about 20,000 years worth. The graph below was taken from Wikipedia, but the data behind this graph are widely known and accepted. NASA, for example, accepts this data and the government of Canada publishes a similar graph.
First, look at the vertical scale. It ranges over about 120 meters (not millimeters), about 400 feet. On the page you see this graph, a change of 200 millimeters (or the change in the last 120 years per the IPCC) would be would be about the width of your eyelash. When the seas were 400 feet lower, people could walk from Russia to Alaska and from France to England.
We engineers have a saying: measure with a micrometer, mark with chalk, cut with an axe.
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